... Proximity Sensitivity: 10 mm ± 3mm. Battery for Electromagnetic Pen: 1.5VDC, Alkaline AAA Size x 1. Battery ... molded plastic components and a PCBA. The tip of the pen can be used for pointing, drawing, sketching ... and the right buttons of mouse.The electromagnetic pen adopts a single AAA size alkaline battery, and ... hours.The power will be suspended if the pen tip and the side buttons are not active for ...